1. The Industrial Revolution began in Great Britain due to a combination of factors including population growth, agricultural advances, trade increases, technological innovations like the steam engine, and Britain's political/social climate. 
2. Industrialization then spread to other European countries and later the U.S. and Japan, driven by factors like natural resources, growing populations, transportation infrastructure, and available capital. 
3. Industrialization in Spain was delayed by limitations such as a small domestic market, poor infrastructure, and lack of capital. Working conditions during the Industrial Revolution were difficult for many, with long hours, low pay, and few rights or protections.